[DRE-maint] Bug#996347: ruby-prawn: FTBFS with ruby3.0: ERROR: Test "ruby3.0" failed: ArgumentError:

[Antonio Terceiro]

Source: ruby-prawn
Version: 2.3.0+dfsg-1
Severity: serious
Justification: FTBFS
Tags: bookworm sid ftbfs
User: debian-ruby at lists.debian.org
Usertags: ruby3.0

Hi,

We are about to enable building against ruby3.0 on unstable. During a test
rebuild, ruby-prawn was found to fail to build in that situation.

To reproduce this locally, you need to install ruby-all-dev from experimental
on an unstable system or build chroot.

Relevant part (hopefully):
>      ArgumentError:
>        Unknown type of gradient: [[0, 10], [15, 15], "FF0000", "0000FF", {}]
>      # /<<PKGBUILDDIR>>/spec/prawn/graphics_spec.rb:441:in `block (6 levels) in <top (required)>'
>      # /<<PKGBUILDDIR>>/spec/prawn/graphics_spec.rb:440:in `block (5 levels) in <top (required)>'
>      # /<<PKGBUILDDIR>>/spec/prawn/graphics_spec.rb:439:in `block (4 levels) in <top (required)>'
>      # /<<PKGBUILDDIR>>/spec/prawn/graphics_spec.rb:473:in `block (5 levels) in <top (required)>'
> 
> Finished in 5.36 seconds (files took 0.42966 seconds to load)
> 855 examples, 3 failures, 23 pending
> 
> Failed examples:
> 
> rspec /<<PKGBUILDDIR>>/spec/prawn/graphics_spec.rb:454 # Prawn::Graphics Patterns gradient transformations when :apply_transformations is true uses the transformation stack to translate user co-ordinates to document co-ordinates required by /Pattern
> rspec /<<PKGBUILDDIR>>/spec/prawn/graphics_spec.rb:463 # Prawn::Graphics Patterns gradient transformations when :apply_transformations is false doesn't transform the gradient
> rspec /<<PKGBUILDDIR>>/spec/prawn/graphics_spec.rb:471 # Prawn::Graphics Patterns gradient transformations when :apply_transformations is unset doesn't transform the gradient and displays a warning
> 
> ERROR: Test "ruby3.0" failed: 


The full build log is available at
https://people.debian.org/~kanashiro/ruby3.0/round2/builds/3/ruby-prawn/ruby-prawn_2.3.0+dfsg-1+rebuild1633391110_amd64.build.txt
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